In a study published online in the International Journal of Cardiology, researchers at Beth Israel Deaconess Medical Center (BIDMC) examined the effects of three healthy diets. Emphasizing different macronutrients — carbohydrates, proteins, or unsaturated fats — on a biomarker that directly reflects heart injury. Using highly specific tests, the team found that all three diets reduced heart cell damage and inflammation, consistent with improved heart health. It is important to follow healthy foods to prevent heart disease said the report.
Juraschek and colleagues analyzed stored blood samples from 150 participants of the Optimal MacroNutrient Intake Trial to Prevent Heart Disease (OmniHeart) trial, a two-center, inpatient feeding study conducted in Boston and Baltimore between April 2003 and June 2005. The participants — all of whom had elevated blood pressure, but were not yet taking medications to control hypertension or cholesterol — were fed each of three diets — emphasizing carbohydrates, protein, or unsaturated fat — for six weeks with feeding periods separated by a washout period.
All three healthy diets reduced heart injury and inflammation and acted quickly within a 6-week period. However, changing the macronutrients of the diet did not provide extra benefits. This is important for two reasons: First, the effects of diet on heart injury are rapid and cardiac injury can be reduced soon after adopting a healthy diet. Second, it is not the type of diet that matters for cardiac injury (high or low fat, high or low carb), but rather the overall healthfulness of the diet.

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